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Thanks for your reply. How to integrate discrete values over a surface I'm new to Comsol. How can I define an integration for a variable within limits? shown in Fig.1, surface roughness can be present either on the two metal plates or on the dielectric surface deposited on the bottom electrode. Volume Integration, Surface Integration, and Line Integration d s. In this case it is d a that represents the area element on the surface. How to integrate Far Field emw.normEfar over the solid angle defined by inclination (polar) angle theta form 0 to 60 degrees, and azimuthal angle phi from 0 to 360 degrees? scattering cross section & comsol | Forum for Electronics How to define an integration for a variable? - COMSOL Any ideas/help would be greatly appreciated . these modules have a heat output of 25W each and their dimensions are 2.7 x 1.5 x 1.5 cm. Hi If I understand you correctly, you have a 2D model (x,y) with a variable "h" and you need the integral as stated, for me you define over the desired domain a domain integration operator "intop1()*", and then in a Results Derived Value Global evaluation analysis type in (in V4): In matlab, we can use int (f (x),x0,x1) which represents the integration of f (x . If you want to extract the external surface of a dataset, apply the Extract Surface filter. Volume Integration () to evaluate an integral over a set of domains in 3D models. Surface Integral over a sphere - Mathematics Stack Exchange The J vector have same norm and tang (mostly x direction) component as you can see on uploaded pictures. But in the same time, i have result for tangent (x, y direction). Note that integrating 1 over a domain is equivalent to evaluating the volume of that domain, integrating 1 over a boundary gives the surface area, and integrating 1 along an edge gives the length. Postprocessing (Integration) of a Far Field. - comsol.ru